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They, and products like are useless devices that are over-marketed and over-hyped trying to find people willing to part with $$$ with the hopes that they will gain something.
It's about as effective as putting magnets on your fuel line to align the fuel molecules so they "burn better".
If someone wants to spend their hard-earned cash on useless junk, I now sell "fuel butter" for $79.95.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.